LU-14954 socklnd: fix link state detection

LU-14954 socklnd: fix link state detection

Due to matching only the device index, link detection implemented
in LU-14742 has issues with confusing the link events for the
virtual interfaces with the link events for the interface that
LNet was actually configured to use. Fix this by improving
the identification of the event source: use both device name and
device index.

Also, to make sure the link fatal state is cleared only when
the device is bound to the IP address used at NI creation,
subscribe to inetaddr events in addition to the netdev events.

Test-Parameters: trivial
Fixes: fc2df80e96dc ("LU-14742: detect link state to set fatal error")
Signed-off-by: Serguei Smirnov <ssmirnov@whamcloud.com>
Change-Id: Ib1996c66a8ae2596970d66e3d920702190851e3f